Use tamperdata to view and modify HTTP/HTTPS headers and post parameters...
Session Manager saves and restores the state of all or some windows - either when you want it or automatically at startup and after crashes. It can also automatically save the state of open windows individually.
Web page and text translator, dictionary, grammar checker, auto translation, text-to-speech, and language learning services. Supports over 3,000 unique language pairs and 31 online translators, including Google Translate, Wikipedia, and Babylon. Lang...
Make the resources behind container pages easily downloadable by DownThemAll!
StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.
FoxClocks shows times around the world - or just your local time - at the bottom of your browser. It deals with daylight saving time so you don't have to.
Control what gets sent as the HTTP Referer on a per-site basis.
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
Make your browsing experience faster by avoiding wait time on DNS lookups
Real Kiosk is a Firefox extension that defaults to full screen, disables all menus, toolbars, key commands and right button menus. Alt+Home still takes you home. ...
Shareaholic is the easiest way to share interesting links using Facebook, Twitter, Google Mail, Reader, Bookmarks, Evernote, Bitly, StumbleUpon, and more... from one simple ALL-IN-ONE add-on. This is the ultimate tool for the link sharing addict!
Forget about the blank new tab! New Tab King brings the most personalized launchpad to the sites you use the most, recently closed tabs, suggested sites and more - forget about a blank tab - Get New Tab King now!
InFormEnter adds a small, clickable icon next to every input field in a web form, from where you can select the item to be inserted - no typing required.